Explosion-proof assembly and method for producing same

Abstract

The invention relates to an explosion-proof assembly (20) designed to guide at least one conductor device (21) through a wall in a flameproof manner. The assembly (20) has a bushing part (24) with a bushing opening (48) having a bushing surface (49). The bushing part (24) is arranged in the wall. The bushing opening (48) has an associated connecting body (23) with at least one conductor channel (29) through which a conductor device (21) extends. The connecting body (23) has a connecting portion (30), which is connected to the conductor (22) in a frictionally engaged and/or form-fitting manner by plastic deformation. A first delimiting surface (32) is formed on the plastically deformed connecting portion (30), and the bushing surface (49) defines a second delimiting surface (33). A flameproof Ex gap (34) is formed between the two delimiting surfaces (32, 33) by inserting the connecting portion (30) into the bushing opening (48).

The invention claimed is: 
     
       1. An explosion-proof assembly ( 20 ) comprising:
 an explosion-proof housing that separates a space from an atmosphere that is at risk for an explosion, 
 said explosion-proof housing having a wall portion, 
 at least one bushing part ( 24 ) having at least one bushing opening ( 48 ) which has a bushing surface ( 49 ), 
 at least one connecting body ( 23 ) having at least one conductor channel ( 29 ) extending through the connecting body ( 23 ) in a longitudinal direction (L), 
 a conductor device ( 21 ) extending through the at least one conductor channel ( 29 ) having at least one electrical and/or at least one optical conductor ( 22 ), 
 said at least one bushing part ( 24 ) being immovably arranged on the housing wall portion against movement in the longitudinal portion (L), 
 a single connecting body ( 23 ) having a connection portion ( 30 ) made of a plastically deformable material containing metal and being plastically deformed into inwardly pressing relation to the at least one conductor ( 22 ) for connecting the connecting body ( 23 ) to the conductor device ( 21 ) in a frictionally engaged manner, 
 said plastically deformed connecting portion ( 30 ) of said connecting body ( 23 ) forming a first delimiting surface ( 32 ) which together with a second delimiting surface ( 33 ) defined by said bushing surface ( 49 ) of the least one bushing part opening ( 48 ) form a flameproof Ex gap ( 34 ), and said first delimiting surface ( 32 ) and said second delimiting surface ( 33 ) are surfaces without indentations or protrusions. 
 
     
     
       2. The explosion-proof assembly of  claim 1  in which said connecting body ( 23 ) rests directly and without a flamegap against the at least one conductor device ( 21 ). 
     
     
       3. The explosion-proof assembly of  claim 2  in which said connecting portion ( 30 ) of the connecting body ( 23 ) engages the conductor device ( 21 ) with a flameproof connection, said first delimiting surface ( 32 ) is arranged coaxially relative to the flameproof connection between the connecting body ( 23 ) and the conductor device ( 21 ). 
     
     
       4. The explosion-proof assembly of  claim 1  in which said conductor device ( 21 ) extend through said connecting body ( 23 ) with a flameproof encapsulation (EX d). 
     
     
       5. The explosion-proof assembly of  claim 1  in which said flameproof Ex gap ( 34 ) is an air gap. 
     
     
       6. The explosion-proof assembly of  claim 1  in which said first delimiting surface ( 32 ) and said second delimiting surface ( 33 ) in cross-section each has a curved contour, without vertices. 
     
     
       7. The explosion-proof assembly of  claim 1  in which said connecting portion ( 30 ) has a length more than 70% of the length of the connecting body ( 23 ). 
     
     
       8. The explosion-proof assembly ( 20 ) in which said at least one bushing part ( 24 ) has a flame-proof threaded connection with said housing wall portion. 
     
     
       9. The explosion-proof assembly ( 20 ) of  claim 1  in which said at least one bushing part ( 24 ) has a flame-proof integrally bonded connection with said housing wall portion. 
     
     
       10. The explosion-proof assembly of  claim 1  in which said at least one bushing part ( 24 ) is an integral part of said housing wall portion. 
     
     
       11. The explosion-proof assembly of  claim 1  in which said first delimiting surface ( 32 ) of said connecting body ( 23 ) has an outer dimension less than an inner dimension of the second delimiting surface ( 33 ) of said bushing part ( 24 ).